Hydration Of Anhydrite: Gypsum can also kind throughout the hydration of anhydrite (CaSO₄). Anhydrite can be a calcium sulfate mineral that lacks the water molecules present in gypsum. When exposed to water, anhydrite undergoes a hydration reaction, incorporating water molecules into its framework and transforming into gypsum. Salt Flats: Gypsum https://www.propanraya.com/id/produk/eco-gypsum-ee-4050